Ebook: The RISC-V Instruction Set Manual: Volume I: User-Level ISA

This is version 2.2 of the document describing the RISC-V user-level architecture.

RISC-V (pronounced risk-ve") is a new instruction set architecture (ISA) that was originally designed to support computer architecture research and education, but which we now hope will also become a standard free and open architecture for industry implementations.